Off-chain transaction Updated 2025-07-16
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Toffoli gate Updated 2025-07-16
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x86 Paging Tutorial / PSE Updated 2025-07-16
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Page size extension.
Allows for pages to be 4M (or 2M if PAE is on) in length instead of 4K.
PSE is turned on and off via the PSE bit of cr4.
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x86 Paging Tutorial / Segmentation Updated 2025-07-16
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In x86 systems, there may actually be 2 address translation steps:
  • first segmentation
  • then paging
like this:
(logical) ------------------> (linear) ------------> (physical)
             segmentation                 paging
The major difference between paging and segmentation is that:
  • paging splits RAM into equal sized chunks called pages
  • segmentation splits memory into chunks of arbitrary sizes
Paging came after segmentation historically, and largely replaced it for the implementation of virtual memory in modern OSs.
Paging has become so much more popular that support for segmentation was dropped in x86-64 in 64-bit mode, the main mode of operation for new software, where it only exists in compatibility mode, which emulates IA-32.
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Competitive programming Updated 2025-07-16
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A waste of time like the rest of the knowledge olympiads.
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Magarena Updated 2025-07-16
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Open source MtG engine implementation written in Java.
Seems to have an option to download art from internet as well.
Ciro Santilli wonders how legal it is. They very explicitly do not mention the words Magic: The Gathering anywhere.
Their UI does a good job at being self explanatory. Space is the shortcut to skip phases.
No online play.
TODO it appears to parse card functionality out of the human readable text! That's genius, as it helps automatically get new cards working, and squirt around legal issues.
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Marc Verdiell Updated 2025-09-11
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Marc Verdiell is a French electrical engineer born in 1963 or 1964[ref] and best known for being the creator and host of the CuriousMarc YouTube channel where he does mind blowing repairs and reverse engineering of vintage computers and other electronic equipment.
Marc sold his company LightLogic, an optoelectronics company he founded, to Intel in April 2001. This was just after the dot-com crash, but Intel apparently still correctly believed that the networking and the Internet would continue to grow and was investing in the area. His associate Frank Shum sued claiming he should be credited for some of the inventions sold but lost and Marc got it all.[ref][ref][ref]. Marc was then almost immediately appointed an Intel fellow at the extremelly early age of 37, and then stayed for a few years at Intel until 2006 according to his LinkedIn.[ref][ref]
Figure 1.
Marc Verdiell at the Computer History Museum
. Source. Location inferred from Marc's videos, but likely, he often frequents the place, and it looks a bit like that.
Marc's full name is actualy Jean-Marc Verdiell, but Ciro Santilli remembers there was one YouTube video where he mentions he gave up on "Jean" partly because anglophones would murder its pronounciation all the time.
Marc's PhD thesis is listed at: theses.fr/1990PA112048 and it is entitled:
Mise en phase de reseaux de lasers a semi-conducteur
which is translated into English as:
Phase locking of semiconductor laser arrays
but the full text is not available online.
Video 1.
Profile of Marc Verdiell by Gizmodo (2018)
Source.
youtu.be/ZgAreiFXhJk?t=253 lists some famous people who live there. It's like a micro heaven.
And a person who makes open educational content like Marc, truly deserves it.
Atherton managed to keep the entire place green and every house has a pool. Wikipedia comments web.archive.org/web/20220906010554/https://www.forbes.com/home-improvement/features/most-expensive-zip-codes-us/:
Atherton is known for its wealth; in 1990 and 2019, Atherton was ranked as having the highest per capita income among U.S. towns with a population between 2,500 and 9,999, and it is regularly ranked as the most expensive ZIP Code in the United States [(94027)]. The town has very restricting zoning, only permitting one single-family home per acre and no sidewalks. The inhabitants have strongly opposed proposals to permit more housing construction and Forbes confirms it for 2022: web.archive.org/web/20220906010554/https://www.forbes.com/home-improvement/features/most-expensive-zip-codes-us/, by far on top.
Marc has reached out to us and requested that some personal information be removed from this article, to which we complied.
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Those who can't do, teach Updated 2025-07-16
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x86 Paging Tutorial / Single level paging scheme visualization Updated 2025-07-16
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This is how the memory could look like in a single level paging scheme:
Links   Data                    Physical address

      +-----------------------+ 2^32 - 1
      |                       |
      .                       .
      |                       |
      +-----------------------+ page0 + 4k
      | data of page 0        |
+---->+-----------------------+ page0
|     |                       |
|     .                       .
|     |                       |
|     +-----------------------+ pageN + 4k
|     | data of page N        |
|  +->+-----------------------+ pageN
|  |  |                       |
|  |  .                       .
|  |  |                       |
|  |  +-----------------------+ CR3 + 2^20 * 4
|  +--| entry[2^20-1] = pageN |
|     +-----------------------+ CR3 + 2^20 - 1 * 4
|     |                       |
|     .    many entires       .
|     |                       |
|     +-----------------------+ CR3 + 2 * 4
|  +--| entry[1] = page1      |
|  |  +-----------------------+ CR3 + 1 * 4
+-----| entry[0] = page0      |
   |  +-----------------------+ <--- CR3
   |  |                       |
   |  .                       .
   |  |                       |
   |  +-----------------------+ page1 + 4k
   |  | data of page 1        |
   +->+-----------------------+ page1
      |                       |
      .                       .
      |                       |
      +-----------------------+  0
Notice that:
  • the CR3 register points to the first entry of the page table
  • the page table is just a large array with 2^20 page table entries
  • each entry is 4 bytes big, so the array takes up 4 MiB
  • each page table contains the physical address a page
  • each page is a 4 KiB aligned 4 KiB chunk of memory that user processes may use
  • we have 2^20 table entries. Since each page is 4 KiB == 2^12, this covers the whole 4 GiB (2^32) of 32-bit memory
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Communication with extraterrestrial intelligence Updated 2025-07-16
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Commutative ring Updated 2025-07-16
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Two ways to see it:
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Master's degree Updated 2025-07-16
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In your normal 2020 broken educational system, it is the first time at which students get an official chance to learn something advanced, and possibly prepare to go venture into the PhD desert.
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Pluto Updated 2025-07-16
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Synchronous dynamic random-access memory Updated 2025-07-16
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x86 Paging Tutorial / TLB Updated 2025-07-16
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The Translation Lookahead Buffer (TLB) is a cache for paging addresses.
Since it is a cache, it shares many of the design issues of the CPU cache, such as associativity level.
This section shall describe a simplified fully associative TLB with 4 single address entries. Note that like other caches, real TLBs are not usually fully associative.
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CIA 2010 covert communication websites / Searching for Carson Updated 2025-07-16
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Edit: Carson was found Oleg Shakirov's findingsby Oleg Shakirov: alljohnny.com, communicated at: twitter.com/shakirov2036/status/1746729471778988499, earliest archive from 2004 (!): web.archive.org/web/20040113025122/http://alljohnny.com/, The domain was hidden in plain sight, it was present in a not very visible watermark visible in the Reuters article screenshot! The watermark was added to the CIA to the background image, it is actually present on the website. In retrospect, it was actually present at on the expired domain trackers dataset, but the mega discrete all second word made Ciro Santilli miss it: github.com/cirosantilli/expired-domain-names-by-day-2015/blob/9d504f3b85364a64f7db93311e70011344cff788/07/05/02#L1572
Figure 1.
2004 Wayback Machine archive of alljohnny.com
.
What follows is the previous
The fact that the Reuters article has a screenshot of it, and therefore a Wayback Machine link, plus the specificity of the website topic, will likely keep Ciro awake at night for a while until someone finds that domain.
Some text visible on the Reuters screenshot:
It is unclear however if this text is plaintext or part of a an image.
Some failed attempts, either dry guesses or from DNS grepping dataset searches:
Searching the Wayback Machine proved fruitless. There is no full text search: Wayback Machine full text search, and a heuristic web.archive.org/web/20230000000000*/Johnny%20Carson search has relevant hits but not the one we want.
Another attempt was to search for "carson" on webmasterhome.cn which lists expired domains in bulk by expiration day, and it search engine friendly. It contains most of the domains we've found so far. Google either doesn't support partial word search or requires you to be a God to find it
so we settle for DuckDuckGo which supports it: duckduckgo.com/?q=site%3Awebmasterhome.cn+%22carson%22&t=h_&ia=web Adding years also helps: duckduckgo.com/?q=site%3Awebmasterhome.cn+%22carson%22+2011&ia=web with this we might be getting all possible results. Ciro went through all in 2011, 2012 and 2013 but no luck. Also fuck en.wikipedia.org/wiki/Carson_City,_Nevada and en.wikipedia.org/wiki/Carson,_California :-)
Let's search tools.whoisxmlapi.com/reverse-whois-search for "carson" contained in any historic domain name. 10,001 lines. Grepping those, no good Wayback machine hits for those that also contain "johnny" or "show". Data at: raw.githubusercontent.com/cirosantilli/media/master/cia-2010-covert-communication-websites/tools.whoisxmlapi.com_reverse-whois-search_carson.csv in case anyone want to try and dig...
Let's also search the fortuitously timed 2013 DNS Census.
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Competition law Updated 2025-07-16
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Complex coordinate space Updated 2025-07-16
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Worms Armageddon Updated 2025-07-16
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Video 1.
Holy Hand Grenade demo from Worms Armageddon by kycbkycb (2009)
Source.
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XML Updated 2025-07-16
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